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English Wikipedia has an article on:
English Wikipedia has an article on:
A solidus of Constantine.
A Byzantine solidus.


From classical Latin solidus (solid), see below.

In numismatic and weight senses, via medieval Latin solidus (various coins), from Late Latin solidus (a gold coin of the Roman Empire). In chemical sense, via German Solidus, coined by H.W.B. Roozeboom in his 1899 Zeitschrift für Physikalische Chemie, Stöchiometrie, und Verwandtschaftslehre (XXX, page 387).

In typography, from the shilling mark originally being an abbreviation (a long sſ⟩), of Medieval Latin solidus meaning shilling.



solidus (plural solidi or soliduses)

  1. (historical) Various medieval and early modern coins or units of account, particularly:
    1. A Roman ~23k gold coin introduced by Diocletian in AD 301 and called by that name, but reissued at a slightly lower weight by Constantine I.
    2. Its successor Byzantine coins, from the eleventh century onward of progressively debased weight and purity.
    3. (obsolete) Synonym of sol or sou: a Carolingian unit of account equivalent to a solidus of silver.
    4. (obsolete) Synonym of soldo: the silver coins of various Italian states.
    5. (obsolete) Synonym of shilling: an English unit of account and, following the Tudor dynasty, silver coin.
  2. (historical) The weight of the Roman gold coin, 1/60 of a Roman pound under Diocletian or 1/72 lb. (about 4.5 grams) after Constantine.
  3. (historical) A medieval French weight, 1/20 of the Carolingian pound.
  4. (typography) Synonym of slash/⟩, originally (Britain) in its use as the shilling mark and now its formal designation by the ISO and Unicode.
  5. (typography) The formal name of the oblique strikethrough overlay (as in A̷ and B̸) in Unicode.
  6. (typography) The division line between the numerator and the denominator of a fraction, whether horizontal or oblique.
  7. (chemistry, physics) The line in a phase diagram marking the temperatures and pressures below which a given substance is a stable solid.



See also[edit]


  • Oxford English Dictionary, "solidus, n.1" and "solidus, n.2"
  • solidus in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
  • solidus at OneLook Dictionary Search



Alternative forms[edit]


From Proto-Italic *soliðos, from Proto-Indo-European *solh₂-i-dʰ-o-s (entire), suffixed form of root *solh₂- (integrate, whole).



solidus (feminine solida, neuter solidum, comparative solidior); first/second-declension adjective

  1. solid


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative solidus solida solidum solidī solidae solida
Genitive solidī solidae solidī solidōrum solidārum solidōrum
Dative solidō solidō solidīs
Accusative solidum solidam solidum solidōs solidās solida
Ablative solidō solidā solidō solidīs
Vocative solide solida solidum solidī solidae solida

Derived terms[edit]



solidus m (genitive solidī); second declension

  1. A solidus: a Roman ~23-carat gold coin introduced by Diocletian in AD 301.
  2. (Medieval) A bezant: the solidus's debased Byzantine successors.
  3. (Medieval) A shilling, as a unit of account or silver coin.
    • c. 1300, Tractatus de Ponderibus et Mensuris
      Libra continet viginti solidos
      The [London] pound contains twenty shillings.


Second-declension noun.

Case Singular Plural
Nominative solidus solidī
Genitive solidī solidōrum
Dative solidō solidīs
Accusative solidum solidōs
Ablative solidō solidīs
Vocative solide solidī



  • solidus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • solidus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • solidus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • solidus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • solidus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • solidus in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[1], pre-publication website, 2005-2016
  • solidus in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
  • solid in The Century Dictionary, New York, N.Y.: The Century Co., 1911.